I promise you, they will bond with you and love you - it just takes a lot of time and patience! Haha, yes, I know a lot of people say that they aren't ideal pets, but to me, they are some of the best.
Could you get a picture of Jynx's pouch? It's likely that she has joeys in there. If she was housed with an unneutered male at the pet store, it's very likely that she got pregnant before she came home to you. I used to be a hobby breeder, so I'm happy to answer any questions you have about the breeding process and baby development, etc.
Oh yes, that is so true - research can't prepare you for everything! I learned that the hard way. With gliders, you learn a lot by experience, trial and error.
I'm attaching some pictures of my girl Dreamer when she had joeys in her pouch. The first one is about fifteen days before the babies came out, the second is three days before the babies came out.
I hope this helps some! I'm here to answer any more questions you have. :)